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中国油料作物学报 ›› 2017, Vol. 39 ›› Issue (6): 737-.doi: 10.7505/j.issn.1007-9084.2017.06.003

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Fitness of BC3F5 between two herbicide-resistant transgenic oilseed rapes and wild Brassica juncea

  

  1. Nanjing Agricultural University, Nanjing 210095, China
  • Online:2017-12-28 Published:2018-03-19

Abstract:

In order to provide a base for evaluating whether the herbicide resistant transgene from oilseed rape could introgress into wild relative weed (wild Brassica juncea), fitness of the fourth progeny of the third backcross generation, which derived from herbicide-resistant transgenic oilseed rape and wild Brassica juncea, was studied. The fitness components of BC3mF5R, BC3pF5R and BC3mF5L, BC3pF5L (R and L denoted backcross progeny obtained with glyphosate-resistant and glufosinate-resistant transgenic oilseed rape respectively. m and p denoted backcross progeny obtained with wild B. juncea as maternal plants and paternal plants respectively) between transgenic oilseed rape and wild B. juncea in field at low (15 plants per plot) and high density (30 plants per plot) under pure and mixed stands (wild B. juncea : BC3F5=1:1) were measured. The fitness components and composite fitness of BC3F5 was fit as wild B. juncea in pure stands under two densities and in mixed stands at low density. Under equal proportions at high density, BC3F5R had the similar fitness components and composite fitness to wild B. juncea. However, the main fitness components and composite fitness of BC3F5L was inferior to wild B. juncea. Correlation analysis showed that there was significant correlation between main fitness components of BC3F5 and planting density. BC3F5 between glyphosate- or glufosinate-resistant transgenic oilseed rape and wild B. juncea had the strong survival ability. Moreover, the ecological risk of gene flow was higher from glyphosate-resistant transgenic oilseed rape than that from glufosinate-resistant transgenic oilseed rape. Therefore both initial hybrid from transgenic oilseed rape to wild B. juncea and backcross between wild B. juncea and F1 or subsequent generations should be prevented to avoid producing higher fitness backcross generation.

Key words: glyphosate-resistant transgenic oilseed rape (Brassica napus), glufosinate-resistant transgenic oilseed rape, wild Brassica juncea, backcross generations, fitness